A metal rod of length $$10$$ cm and a rectangular cross section of $$1cm$$×$$12cm$$ is connected to a battery across opposite faces. The resistance will be

Correct option is 1maximum when the battery is connected across 1cm×12cm faces.

Questions

A metal rod of length $10 c m$ and a rectangular cross section of $1 c m \times \frac{1}{2} c m$ is connected to a battery across opposite faces. The resistance will be

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maximum when the battery is connected across 1cm×12cm faces.

maximum when the battery is connected across 10cm×1cm faces

maximum when the battery is connected across 10cm×12cm faces.

same irrespective of the three faces.

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detailed solution

Correct option is A

R=ρLA, Rmax⇒Lmax and Aminimum

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A metal rod of length 10 cm and a rectangular cross section of 1cm×12cm is connected to a battery across opposite faces. The resistance will be

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A metal rod of length $10 c m$ and a rectangular cross section of $1 c m \times \frac{1}{2} c m$ is connected to a battery across opposite faces. The resistance will be